A dispenser for viscous, extrudable materials uses a sprocket-driven push chain that is drawn from a chain magazine responsive to actuation of a user trigger. The sprocket for the chain is driven by a toothed wheel, which is driven by a first, ratcheting drive pawl, which is actuated by the trigger.
A dispenser for viscous, extrudable materials uses a sprocket-driven push chain that is drawn from a chain magazine responsive to actuation of a user trigger. The sprocket for the chain is driven by a toothed wheel, which is driven by a first, ratcheting drive pawl, which is actuated by the trigger. A second ratcheting locking pawl prevents the toothed wheel and hence the chain sprocket from rotating backward when the trigger is released. A single “button” or actuator can be actuated by one hand of a user while the user's other hand grasps a chain retractor to pull an extended chain back to a starting position whereat the dispenser can be reloaded.
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1. A dispenser comprising: a first pawl coupled to a first axle and configured to engage and disengage notches on a toothed wheel coupled to a second axle responsive to angular translation of the first pawl about the first axle, the first pawl being configured to drive the toothed wheel in a first d
1. A dispenser comprising: a first pawl coupled to a first axle and configured to engage and disengage notches on a toothed wheel coupled to a second axle responsive to angular translation of the first pawl about the first axle, the first pawl being configured to drive the toothed wheel in a first direction responsive to engagement of the first pawl with a notch in the toothed wheel and angular translation of the first axle around the second axle in said first direction;a second pawl coupled to a third axle, the second pawl having first and second portions, both of which extend away from the third axle, the first portion extending from the third axle toward the toothed wheel and configured to engage and disengage notches in the toothed wheel responsive to rotation of the second pawl around the third axle, the first portion being biased to engage notches on the toothed wheel, the first portion capable of being disengaged from the notches responsive to a force applied to the second portion of the second pawl;the first pawl, toothed wheel and second pawl being configured such that engagement of the first end of the second pawl with notches in the toothed wheel allows the toothed wheel to be driven in the first direction by the first pawl but prevents the toothed wheel from rotating in an opposite second direction, disengagement of the first end of the second pawl from the toothed wheel responsive to a force applied to second end of the second pawl also causes the first pawl to disengage from the toothed wheel and thereby allows the toothed wheel to rotate in the second direction; andan actuating trigger having first and second opposing ends, the first end being rotatably coupled to the first axle and including an arm configured to support the second axle, the actuating trigger configured to translate between first and second angular positions relative to the first axle and thereby cause the second axle to translate around the first axle between the first and second angular positions. 2. The rodless dispenser of claim 1, further comprising: a sprocket having a plurality of teeth, the sprocket being attached to and configured to rotate with the toothed wheel;a push chain having first and second ends and a plurality of chain links between said ends, the chain links and sprocket being configured such that at least some of the chain links wrap part way around the sprocket. 3. The rodless dispenser of claim 2, wherein the push chain, when wrapped part way around the sprocket, comprises first and second substantially straight sections of chain, the corresponding links of which are fully unfolded, the first and second substantially straight sections extending away from the sprocket, the push chain being additionally comprised of a curving third section of chain between the first and second substantially straight sections of chain: the curving third section being comprised of chain links that engage sprocket teeth, the curving third section extending part way around the sprocket, the rodless dispenser being additionally comprised of first and second push chain retainers fixed at locations proximate to where the first and second substantially straight sections of the chain meet the third section of the chain as the sprocket rotates and moves the chain. 4. The rodless dispenser of claim 2, wherein the push chain comprises first and second substantially straight sections of chain and a third section of chain that curves about the sprocket, and the first and second substantially straight sections of chain extend laterally away from the third section, substantially parallel to each other. 5. The rodless dispenser of claim 1, wherein the first pawl is biased into normal engagement with the toothed wheel independent of an angular position of the trigger. 6. A rodless dispenser comprising: a push chain magazine;a sprocket having a plurality of teeth,a push chain having first and second ends and a plurality of links between the first and second ends, at least one link of the plurality engaged with at least one tooth of the plurality of teeth, the first end being located in the magazine and capable of translating back and forth therein responsive to rotation of the sprocket, the second end of the push chain translatable towards and away from the sprocket;a toothed wheel comprising: a plurality of notches coupled to the sprocket such that rotation of the toothed wheel causes rotation of the sprocket;a first axis, at least one of the toothed wheel and the sprocket configured to rotate about the first axis;a first pawl rotatable about a second axis and configured to engage and disengage notches of the toothed wheel responsive to angular translation of the first pawl about the second axis, the first pawl being, configured to rotate the toothed wheel and the sprocket in a first direction, responsive to engagement of the first pawl with a notch in the toothed wheel and an angular displacement of the second axis and drive pawl around the first axis in said first direction;a second pawl having first and second portions, both of which extend away from a third axis about which the second pawl is rotatable, the first portion of the second pawl configured to engage and disengage notches in the toothed wheel responsive to rotation of the second pawl around the third axis, the first portion of the second pawl being biased to rotate on the third axle to engage the notches on the toothed wheel;wherein a force applied to the second portion of the second pawl rotates the second pawl about the third axis and the first pawl about the second axis to disengage the first pawl and the second pawl from the toothed wheel, such that the toothed wheel and sprocket are rotatable in the second direction. 7. The dispenser of claim 6, further comprising a tube support configured to hold a tube containing extrudable material, the tube support having first and second ends, each end having an opening, the push chain extending through the opening in the second end of the tube support such that the second end of the push chain is translatable towards and away from the sprocket within the tube support. 8. The dispenser of claim 7, further comprising: a piston inside the tube support and comprised of a piston head having a center and first and second opposing sides;a piston rod having first and second opposite ends, the first end being attached to and extending from the second side of the piston at a first location on the second side of the piston, the second end of the piston rod being attached to the second end of the push chin, the piston rod having a length defined by the distance between the first and second ends of the piston rod. 9. The dispenser of claim 8, wherein the first location on the piston is offset from the center of the piston head. 10. The dispenser of claim 6, further comprising a push chain retractor comprising a post that extends through a slot, in the push chain magazine and attached to the push chain proximate the first end of the push chain. 11. The dispenser of claim 6, further comprising an actuating trigger having first and second opposing ends, the first end being rotatable about the first axis and including an arm comprising the second axis, the actuating trigger translatable between first and second angular positions relative to the first axis and thereby cause the second axis to translate round the first axis between the first and second angular positions. 12. The dispenser of claim 6, wherein the push chain comprises first substantially straight section of chain comprising the first end and a second substantially straight section of chain comprising the second end and a third section of chain that curves about the sprocket, and the first and second substantially straight sections of chain extend laterally away from the third section. 13. A dispenser comprising: a wheel rotatable about a first axis, the wheel comprising a plurality of notches;a first pawl pivotable about a second axis between a first position and a second position, wherein in the first position the first pawl engages the plurality of notches on the wheel and in the second position the first pawl disengages from the plurality of notches, the second axis angularly translatable about the first axis, and the first pawl being configured to drive the wheel in a first direction when the first pawl engages the notch and the second axis angularly translates about the first axis in the first direction; and a second pawl pivotable about a third axis between a first position and a second position, wherein in the first position the second pawl being biased to the first position to engage and disengage the plurality of notches in the wheel responsive to rotation of the wheel in the first direction, wherein when the second pawl is in the first position, the second pawl prevents rotation of the wheel in a second direction about the first axis, the second direction opposite the first direction, and when the second pawl is moved to the second position, the second pawl disengages the plurality of notches and engages the first pawl to move the first pawl to the second position disengaged from the notch of the plurality of notches thereby permitting rotation of the wheel in the second direction. 14. The dispenser of claim 13, wherein the second pawl further comprises a second pawl first portion extending away from the third axis and a second pawl second portion extending away from the third axis, wherein the second pawl first portion is configured to engage and disengage the plurality of notches and a force applied to the second pawl second portion pivots the second pawl to the second position. 15. The dispenser of claim 14, wherein the first pawl comprises a first pawl first portion extending away from the second axis and a first pawl second portion extending away from the second axis, wherein the first pawl first portion is configured to engage and disengage the plurality of notches and when the second pawl is in the second position, the second pawl second portion engages the first pawl second portion to pivot the first pawl into the second position. 16. The dispenser of claim 13 further comprising: a first axle arranged at the first axis and coupled to the wheel;a second axle arranged at the second axis and coupled to the first pawl; anda third axle arranged at the third axis and coupled to the second pawl. 17. The dispenser of claim 13, further comprising; a sprocket having a plurality of teeth, the sprocket being attached to and configured to rotate with the wheel; anda push chain haying first and second ends and a plurality of chain links between the first and second ends, the chain links and sprocket being configured such that at least some of the chain links wrap pan way around the sprocket. 18. The dispenser of claim 17, wherein the push chain comprises first substantially straight section of chain comprising the first end and a second substantially straight section of chain comprising the second end and a third section of chain that curves about the sprocket, and the first and second substantially straight sections of chain extend laterally away from the third section. 19. The dispenser of claim 17, further comprising: wherein the push chain, when wrapped part way around the sprocket, comprises first and second substantially straight sections of the push chain, the corresponding links of which are fully unfolded, the first and second substantially straight sections extending away from the sprocket, the push chain being additionally comprised of a curving third section of chain between the first and second substantially straight sections of the push chain, the curving, third section being comprised of chain links that engage teeth of the plurality of teeth of the sprocket, the curving third section extending part way around the sprocket; andat least one push chain retainer fixed at a location proximate to where at least one of the first substantially straight section and second substantially straight section meets the curving third section. 20. The dispenser of claim 13, further comprising, an actuating trigger having first and second opposing ends, the first end being rotatable about the first axis and including an arm comprising the second axis, the actuating trigger translatable between first and second angular positions relative to the first axis and thereby cause the second axis to translate round the first axis between the first and second angular positions.
Veltrop, Loren; Schmidt, Eric; Rote, Scott; Somen, Daniel; Kurth, Mark; Eiger, Aaron; Payne, Timothy; Van Erden, Paulette, Piston and piston rod for a rodless dispenser.
Hamilton Joel A. (101 Hardenburgh Ave. Demarest NJ 07627), Retainer and propulsion apparatus carried in a self-contained handle for use with a removable cartridge.
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